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Concept
Glyph
Summary
A glyph (ɡlɪf) is any kind of purposeful mark. In typography, a glyph is "the specific shape, design, or representation of a character". It is a particular graphical representation, in a particular typeface, of an element of written language. A grapheme, or part of a grapheme (such as a diacritic), or sometimes several graphemes in combination (a composed glyph) can be represented by a glyph.
In most languages written in any variety of the Latin alphabet except English, the use of diacritics to signify a sound mutation is common. For example, the grapheme requires two glyphs: the basic and the grave accent . In general, a diacritic is regarded as a glyph, even if it is contiguous with the rest of the character like a cedilla in French, Catalan or Portuguese, the ogonek in several languages, or the stroke on a Polish "Ł". Although these marks originally had no independent meaning, they have since acquired meaning in the field of mathematics and computing, for instance.
Conversely, in the languages of Western Europe, the dot on a lower-case is not a glyph in because it does not convey any distinction, and an in which the dot has been accidentally omitted is still likely to be recognized correctly. However, in Turkish and adjacent languages, this dot is a glyph because that language has two distinct versions of the letter i, with and without a dot.
In Japanese syllabaries, some of the characters are made up of more than one separate mark, but in general these separate marks are not glyphs because they have no meaning by themselves. However, in some cases, additional marks fulfil the role of diacritics, to differentiate distinct characters. Such additional marks constitute glyphs.
Some characters such as "æ" in Icelandic and the "ß" in German may be regarded as glyphs. They were originally typographic ligatures, but over time have become characters in their own right; these languages treat them as unique letters.
Official source
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